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A 64 year old male with lymphoma has a positive blood cultur…

Posted byAnonymous May 20, 2026June 3, 2026

Questions

A 64 yeаr оld mаle with lymphоmа has a pоsitive blood culture at 18 hours incubation.  The organism is a nonlactose fermenting gram negative bacillus on MacConkey agar.  Further testing gives the following reactions: Biochemical Reactions Oxidase: negative TSI: Alkaline/Acid, no H2S Motility: Positive Indole: Positive Citrate: Positive Ornithine decarboxylase: negative Urea: positive Phenylalanine Deaminase (PDA): positive VP: negative   a. Is this organism a fermenter or a non-fermenter? b. State 1 reason for selecting your answer on Question (a). c. How would the organism appear (color) on the MacConkey plate after 18-24 hours? d. What other biochemical test would support your answer on Question (c). Be specific with your answer. e. What is the IMViC reaction of this organism? f. Without referring to the biochemical reactions and only reviewing the medium colony morphology, why is this organism not E coli or Klebsiella sp? State 1 reason. g. Using biochemical reactions, why is this organism not Proteus sp?  State 1 reason. h. There are at least 3 clinically significant organisms, discussed in class,  that are positive for PDA or phenylalanine deaminase activity.  List all 3 organisms. i. What is the identity of this organism?  j. State one reason to explain your answer in Question (i).  

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Tags: Accounting, Basic, qmb,

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